text: ;The hydraulic jump in a sink
  Figure 2 above illustrates an example of a hydraulic jump, often seen in a kitchen sink. Around the place where the tap water hits the sink, a smooth-looking flow pattern will occur. A little further away, a sudden "jump" in the water level will be present. This is a hydraulic jump.
  On impingement of a liquid jet normally on to a surface, the liquid spreads radially in a thin film until a point where the film thickness changes abruptly. This abrupt change in liquid film thickness is called a circular hydraulic jump. Most articles in literature assume that the thin film hydraulic jumps are created due to gravity (related to the Froude number). However, a recent scientific study questioned this more than century-old belief. The authors experimentally and theoretically investigated the possibility for kitchen sink hydraulic jumps to be created due to surface tension instead of gravity. To rule out the role of gravity in the formation of a circular hydraulic jump, authors performed experiments on horizontal, vertical and on an inclined surface and showed that irrespective of the orientation of the substrate, for same flow rate and physical properties of the liquid, the initial hydraulic jump happens at the same location. They proposed a model for the phenomenon and
  found the general criterion for a thin film hydraulic jump to be 
  where  is the local Weber number and  is the local Froude number. 
  For kitchen sink scale hydraulic jumps, the Froude number remains high, therefore, the effective criteria for the thin film hydraulic jump is . In other words, a thin film hydraulic jump occurs when the liquid momentum per unit width equals the surface tension of the liquid. However, this model stays heavily contested.